Christina and Grant get the chance of a lifetime to visit Peru and the incredible Incan ruins at Machu Picchu. They meet two Peruvian kids looking for their lost llama, and soon step into a mystery filled with a terrifying train ride, baffling artifacts, a scary Inca king, and even some splattering, smelly llama spit! Will they find out who (or what?) is scaring tourists away from the majestic mountain city of Machu Picchu? Read and find out!